TY  - JOUR
AU  - Ros, A.
AU  - Lerche, C. W.
AU  - Sebastia, A.
AU  - Sanchez, F.
AU  - Benlloch, J. M.
PY  - 2014
DA  - 2014//
TI  - Retroreflector arrays for better light collection efficiency of gamma-ray imaging detectors with continuous scintillation crystals without DOI misestimation
T2  - J. Instrum.
JO  - Journal of Instrumentation
SP  - P04009 - 14pp
VL  - 9
PB  - Iop Publishing Ltd
KW  - Gamma detectors (scintillators
KW  - CZT
KW  - HPG
KW  - HgI etc)
KW  - Interaction of radiation with matter
KW  - Gamma camera
KW  - SPECT
KW  - PET PET/CT
KW  - coronary CT angiography (CTA)
KW  - Detector design and construction technologies and materials
AB  - A method to improve light collection efficiency of gamma-ray imaging detectors by using retroreflector arrays has been tested, simulations of the behaviour of the scintillation light illuminating the retroreflector surface have been made. Measurements including retroreflector arrays in the setup have also been taken. For the measurements, positron emission tomography (PET) detectors with continuous scintillation crystals have been used. Each detector module consists of a continuous LSO-scintillator of dimensions 49x49x10 mm(3) and a H8500 position-sensitive photo-multiplier (PSPMT) from Hamamatsu. By using a continuous scintillation crystal, the scintillation light distribution has not been destroyed and the energy, the centroids along the x- and y-direction and the depth of interaction (DOI) can be estimated. Simulations have also been run taking into account the use of continuous scintillation crystals. Due to the geometry of the continuous scintillation crystals in comparison with pixelated crystals, a good light collection efficiency is necessary to correctly reconstruct the impact point of the gamma-ray. The aim of this study is to investigate whether micro-machine retro-reflectors improve light yield without misestimation of the impact point. The results shows an improvement on the energy and centroid resolutions without worsening the depth of interaction resolution. Therefore it can be concluded that using retroreflector arrays at the entrance side of the scintillation crystal improves light collection efficiency without worsening the impact point estimation.
SN  - 1748-0221
UR  - https://doi.org/10.1088/1748-0221/9/04/P04009
DO  - 10.1088/1748-0221/9/04/P04009
LA  - English
N1  - WOS:000336123800049
ID  - Ros_etal2014
ER  -